Typically and by default, the group owner of a file that you create is your primary group, but you can subsequently change the group owner to any of the groups that you belong to.
在通常情况以及缺省情况下，您所创建的文件的组所有者为您的主要组，但是您可以将组所有者更改为您所属的任何组。
For example, if you select files to verify authority attributes, the GUI mines the owner, primary group, etc attributes for each file you selected.
例如，如果您选择文件以验证权限属性，GUI会挖掘您选择的每个文件的所有者、主组等属性。
The /etc/passwd file says that bduda has a primary group of 350.
etc/passwd 文件说明 bduda 有一个主组为 350。
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